<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .flex-box {
        width: 400px;
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        row-gap: 10px;
        column-gap: 20px;
      }
      .item {
        flex: 1 1 100px;
        height: 100px;
        background-color: #f00;
      }
    </style>
  </head>
  <body>
    <div class="flex-box">
      <div class="item">1</div>
      <div class="item">2</div>
      <div class="item">3</div>
      <div class="item">4</div>
      <div class="item">5</div>
      <div class="item">6</div>
      <div class="item">7</div>
      <div class="item">8</div>
    </div>
  </body>
</html>

